Filter cartridge



FIG. 1 is a perspective view of the new design for a filter cartridge;

FIG. 2 is a front view thereof;

FIG. 3 is a side view thereof;

FIG. 4 is a top view thereof; and,

FIG. 5 is a bottom view thereof.

The broken lines in the Figures form no part of the claimed design. 

CLAIM The ornamental design for a filter cartridge, as shown and described. 